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(No Model.) 3 Sheets-Sheet 1.

lVI. R. MUCKLE, Jr.,& W. H. B. TEM/IER. COVER FOR MAN HOLE CHAMBERS OF UNDERGROUND OONDUII'S'.

Patented Nov. 13, 1888.

N. PETERS, Photo-Llhgnpher. Walhingan. DICV (No Model.) 3 Sheets-Sheet 2.

M. R. MUCKLB, Jr.,& W. H. B. TEAMER. COVER FOR MAN HOLE CHAMBERS 0F UNDERGROUND GONDUITS.

laten'edl Nov. 1888.

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(NO Model.) I 3 Sheets-Sheet 3.

M. R. MUCKLE, J r& W. H. B. TEAMER. OOUEE EOE MAN EOLE OEAMEEES OE UNDERGROUND CONDUITE.

No. 892,877. Patented NOU.` 13, 1888.

N. PETERS. Pholljmgnpher, Washington, D. C.

NITED STATES PATENT Brien.

MARK RICHARDS MUCKLE, JR., AND WILLIAM H. B. TEAMER, OF PHILADEL- PIIIA, PENNSYLVANIA; SAID TEAMER ASSIGNOR 'IO SAID MUCKLE.

COVER FOR MAN-HOLE CHAMBERS F UNDERGROUND CONDUITS.

SPECIFICATION forming part of Letters Patent No. 392,877, dated November 13, 1888.

Application filed June 11, 1888. Serial No. $276,071'.

To all whom t may concern:

Be it known that we, MARK Rrcniinns MUcKLn, Jr., and WILLIAM H. B. TEAMER, both citizens of the United States,and residents of Philadelphia, Pennsylvania, haveinvented certain Improvements in Covers for Man-Hole Chambers of Underground Gonduits, of which the following is a specification.

One object of our invention is to so construct the cover for the man-hole chamber of an underground conduit system that a portion of said cover can be readily thrown up whenever there is a heavy pressure within the man-hole chambc1-such,for instance, as might be caused by the explosion of gas which has leaked into the chamber; and a further object of our invention is to permit ready access y to the interior of the man-hole chamber without the necessity of removing the entire cover. These objects we attain in the manner hereinafter set forth, reference heilig had to the accompanying drawings, in which- Figure l is a longitudinal section of the upper part of the structure of a man-hole chamber with covcr constructed in accordance with our invention; Fig. 2, a similar view showing anotherform'of the cover; and Figs. 3 and 4, partial plan views of the structures shown, respectively, in Figs. l and 2.

A represents the cast iron box or easing forming the upper part ofthe structure,which lines or incloses the manhole chamber, the upper portion of this box being recessed to receive the outer portion of the cover.

As shown in Fig. 1, the cover comprises two parts or sections, B B, the former being a fixed section and being secured to the cas ing A, so far as regards vertical movement, by the engagement of hooked lugs a on the under side of the cover, with internally-projecting ribs b on the casing a.

The section B of the cover is movable and is hinged to the fixed section B, preferably by means of links D, one end of each of which is pivoted to the fixed section by means of a pin,

- explosion in the man-hole chamber, or of sudden or excessive pressure therein from any lother cause, the movable section of the cover (No model.)

escape of gas or air in sufficient volume to relieve the pressure.

A'cliecl-chain, g, serves to so limit the rise of the movablcsection of the cover that the same will again fall into place when the pressure is relieved; but this chain can be readily detached when it is desired to turn the movable section over onto the fixed section, as shown by dotted lines in Figs. l and 2, in order to gain access to the man-hole chamber Without removing the entire cover. When it is desired to remove the entire cover from the man-hole chamber, however, the section B is first lifted until its outer free end is above the level on the casing A and the check-chain is detached, whereupon the entire cover may be moved longitudinally until the lugs a are free from engagement with the ribs b, and the vcrtical removal of the fixed section is permitted.

In Figs. 2 and et we have shown another form of our improved cover, in which vboth sections B B of the same are movable, the fixed portion of the cover in this case being a central pivot-pin, d', which has at each endpa hooked lug, a, engaging with the internal ribs, b, on the casing A, each section of the cover being hung to this pivot-pin by means ofalinksection, D', pivoted to the cover by a pin, f. The casing A is preferably provided with internal lugs on all four sides, so that in whatever direction the cover may be applied to the casing proper means will always be afforded for the securing of the fixed portion of the cover to said casing. Y

Vhen the throwing of one section of the cover over onto the other is not considered neeessary,the sections may be hinged directly one to another Without the interposition of the ICO portion by means of one or more links, all subi stantially as specified.

3. The combination of the casing of a manhole chamber With a cover having a. section 5 vertically confined to said casing and a. movable section hinged to said fIXed section, all substantially as specified. Y

4. The combination of the man-hole chamvloer casing having internally-projecting ribs Io with a cover coniprisingafxed portion having lugs for engaging with said ribs, and a movable names to this specication in the presence of I5 i two subscribing witnesses.

M. RICHARDS MUOKLR, JR. v W. H. B. TEAMER. Witnesses:

WILLIAM D. CONNER, HARRY SMITH. 

